CN100550813C - The System and method for of the multimedia conferencing of communication between internal-external network - Google Patents

Abstract

A kind of multimedia conference system and the method that can carry out direct communication between internal-external network, it comprises: the network phone of energy call accepted more than, to constitute internal network; One calling terminal, it is positioned at outside the internal network, and must be connected with internal network through external network; A network address translation, it is between between this calling terminal and this internal network; An acting server, its between between this calling terminal and this internal network, and in logic with the network address translation configured in parallel, build the message of putting agreement be responsible for to receive the meeting of sending by calling terminal, the go forward side by side connection and the transmission of row address are to be sent to the particular network phone with this message.

Description

The System and method for of the multimedia conferencing of communication between internal-external network

Technical field

The present invention is about a kind of System and method for that utilizes the multimedia conferencing of internet communication, especially refer to a kind of public network (Public Network that connects, " external network ") and LAN (Local Area Network, " internal network "), make the interior network phone (Useragent) of internal network can carry out the System and method for of the multimedia conferencing of direct communication to the outer intelligencer of internal network.

Background technology

Along with prevailing of the Internet, application on the internet also presents diversified aspect, the communication of the Internet, from early stage simple transfer of data (Data Transportation), extend to and utilize the TCP/IP communications protocol with transferring voice data (Voice), this is so-called Voice over IP (VoIP), behind the User Outgoing Call, the speech sound signal of its simulation promptly is sent to switch, and process voip gateway device (VoIP gateway) is converted to the speech sound signal of simulation the speech sound signal of numeral, be sent to the communication voip gateway device (VoIPgateway) of end in addition by router (router) addressing again, digital voice signal is transferred to the speech sound signal of simulation.This kind utilizes the Internet to carry out the application of speech communication, and not only the PC (personal computer) from the initial stage carries out communication to the mode of PC, and proceeds to PC to phone, and phone is to PC, even phone carries out to liaison mode.In the recent period, along with the maturation of digitized video technology, also the transmission of image signal (Video) is done in Cheng Gong the Internet that utilizes, and makes that also the video signal communication of dream is come true in the past.

Because internet communication, its data (Data), speech sound signal (Voice) and image signal (Video) can utilize the transmission simultaneously smoothly on the internet of shared TCP/IP package, therefore also the running of all the Internets and communication can be concentrated on the single network architecture and carry out, to carry out data (Data) simultaneously, the communication of speech sound signal (Voice) and image signal (Video), and do not need to use respectively different network systems, therefore be minimized the frequency range rate and the whole cost of overall network communication.

In the communication of the Internet, the both sides of communication are with specific I P (Internet Protocal) address (address) (this refers to " Public IP " address), as the source of confirming communication two party and the address of destination, that is, network communication requires each communication terminal that a public IP (Public IP) all need be arranged, with usefulness as identification destination address in the network communication, yet, rise along with the internal network (Intranet) of enterprise or unit, each internal network (or title " LAN ", LAN) Nei each User is as all there being its independently public individually IP, the day by day not enough problem of the required public IP in the Internet will be caused, and, if 20 User (computer) are arranged in the internal network, and provide 20 public IP to these 20 User, relevant the building that also will increase the external communication of internal network is set to this, therefore, RFC 1918 agreements are to have defined private IP address (Private IP address), use voluntarily with the internal network that offers in enterprise or the unit, because these private IP address, User must not apply for to the upstream, the Internet, also therefore occupy the private IP address that the internal network User of enterprise or unit also can't be seen in the outer the Internet of internal network, in brief, basically these User can only be online with the User in the internal network, and can't be directly carry out communication and communication with outside the Internet.

In the communication of aforementioned the Internet, communication each side must have its specific public ip address to carry out mutual communication and communication, it is mainly because of the communication of the Internet, it about the transmission of data with the TCP package for it, and the information of source that the inside of the file header information (Header) in the TCP package is comprised and destination (initial address and destination address that package transmits) with public IP for it, therefore, TCP package on the Internet can be according to the public IP in its file header information, and the addressing by router (router) transmits.

As for the private ip that User had in the internal network (Private IP), because public the Internet can't its private IP address that is had of identification, therefore, User in the internal network is connected and communication with outside the Internet as desiring, general mode, by " network address translation " (Network Address Translation, " NAT ") for it, its practice is the contained private ip of file header information (header) that the TCP package that each User in the internal network (being the computer of client end) is transmitted is comprised, in addition mapping (mapping) and the public IP that is converted to NAT itself, outside the Internet can be recognized, thereby provide each the interior User of internal network and the Internet of outside to carry out communication.

Now with example it is described, to be that the User of 192.168.1.100 wants external when online when the private ip that has in the internal network:

1. the gateway of this User (gateway) is set at the NAT main frame, so in the time will connecting the Internet, this TCP package will be sent to the NAT main frame, and this moment, the last contained address, source (source IP) of file header information (Header) of TCP package was 192.168.1.100;

2. by the NAT main frame, she can change the public IP ppp0 (is example to dial and connect situation) that the NAT main frame that disguise oneself as is had with the source IP (192.168.1.100) of the file header information on the TCP package of the external communication of User, because the data in the file header information on this TCP package has been made into public IP, therefore, the TCP package that this User transmitted can connect and is sent to outside the Internet, simultaneously the NAT main frame can remember this TCP package be by the User of which address, source (private IP address by: 192.168.1.100) sent;

3. the Internet transmits the TCP package to User, also receive by NAT main frame with public ip address, at this moment, the NAT main frame promptly can remove to inquire about the routing iinformation of record originally, and, change back the original private IP address 192.168.1.100 of User in the internal network with the Target IP (object IP) of the TCP package that sends on the Internet public IP ppp0 by the NAT main frame;

4. last this User that by the NAT main frame this package is sent to original transmission TCP package again.

User in the internal network is by conversion of NAT main frame and media, carry out communication and communication with the Internet with the outside, this kind mode, to the communication of general data no problem still, yet the multimedia conferencing communication that SIP communications protocol (Session Initiation Protocal) is provided, because the existence of NAT or/and fire compartment wall, when carrying out the online calling of meeting according to the SIP communications protocol, it is called out and online can't passing through, and cause internal network and external the Internet can't carry out direct conference communications.

So-called SIP communications protocol, the calling of meeting is set up, adjusts, is stopped in its control with application layer (application-layer) (signal), with the communications protocol (multimedia session) that a multimedia conferencing is provided, simultaneously, SDP (Session DecriptionProtocal) communications protocol that it is relevant then provides the description of the conferencing information in the SIP meeting to stipulate.Because the communication quality that the SIP communications protocol is provided is splendid; and can provide point-to-point direct communication; and; the SIP communications protocol provides quite complete information security service; for example, denial of service avoids authentication (authentication), the integration protection (integrity protection) between (denial-of-service prevention), User and User and between acting server and User and encrypts (encryption) and privacy (privacy) service.Therefore, the communication of the Internet is extensively changed to and is adopted the SIP communications protocol by the H.323 agreement of original employing.

Yet, though the SIP communications protocol can provide point-to-point direct communication and quite complete information security service by splendid communication quality, yet, when facing internal network and require intrinsic fire compartment wall or NAT (Network AddressTranslation) by the information security of safeguarding general data or communication, because the obstruct of fire compartment wall or NAT, the message that causes SIP can't be by to enter into internal network, make between internal-external network utilizing the SIP communications protocol, can't reach point-to-point direct communication with the calling of setting up meeting and online.

Simultaneously, LAN is the information security of maintaining network communication, in external communication, often there is the fire compartment wall (Firewall) of proxy based to set in addition, generally speaking, the source (source) that fire compartment wall is had with the information (incoming traffic) that enters, destination (destination) and information kenel parameters such as (traffic type) determines whether blocking the information flow that (block) enters, therefore, the information that enters (incoming traffic) for unsanctioned (un-trusted public domain) is only begun and can pass through under the situation that communication is initiated by authorized internal network (trusted privatedomain), therefore, for fire compartment wall, the multi-media communication that the SIP communications protocol is provided, owing to how enter calling (incoming call) and carry out the calling of meeting and set up online with unconfirmed, and in the application that cooperatively interacts, there is the problem of mutual bar lattice, though fire compartment wall can provide the dynamic switch of the required multiport of SIP communications protocol, so the information flow that enters not obtaining approval still has the problem on the safety, and the Internet of more feasible outside each User direct and that LAN is interior carries out the problem that point-to-point direct conference communications has it to be difficult to overcome.

Be stored in the porch between external network of internal network for solving NAT or fire compartment wall, cause the SIP communication externally to construct direct point-to-point conference communications between each User of network and internal network, favourable mode in the known practice with human configuration (manually configure), the address of the public IP that NAT is external and multiport (ports), arrive each interior User of internal network by the mapping (staticmappings) of static state, that is, set up the static correspondence table (static mapping table) of the private ip in public IP and the internal network on NAT or the SOCKS server, reach each User of internal network and the communication of external network in this way, yet this method has not only required fixed IP addresses and multiport, and, because of human configuration involves the quite configuration flow (configuration process) of specialty, therefore, only can be suitable for very small-sized LAN, and its inconvenience and impracticable part is arranged.In addition, the open case US2004/0139230A1 " the SIP method of servicing with network of NAT " (SIP Service Method in a Network Having a NAT) of laid-open U.S. Patents on July 15th, 2004 also in an identical manner for it, because it must carry out the mapping of public IP and private ip on NAT or fire compartment wall, and make the User of internal network must be in fixing private ip setting place conference participation, and can't utilize the name correspondence (name mapping) that the SIP communications protocol supported and the service that relocates (redirection) can't, and the conference participation person who loses the SIP communications protocol and provided can not be subjected to its network site restriction to possess the advantage of personal mobility (personal mobility).

Restriction based on aforementioned NAT/ fire compartment wall, (promptly two LAN between) is as desiring to carry out the communication of the Internet between two enterprises or the unit, particularly utilize the Internet to carry out the situation of meeting, most situations is set the server (server) of communication terminal with the public ip address that these LAN were had, desire to carry out two or more LAN of communication with connection, and this enterprise or unit (LAN) also only can carry out the meeting of the Internet with the server of this communication terminal, in brief, desire the personnel that conference participation carries out in this enterprise or the unit, must concentrate in the meeting room of setting communication server, just there is the other end of way and the Internet to carry out meeting, this kind requires to make the people who desires conference participation can carry out meeting at any time on the one hand on its work position, and increase inconvenience and cost, also make the difficulty more of convening of meeting on the other hand.

Thisly can't carry out point-to-point the Internet conference communications, sentence the restriction of carrying out the Internet meeting, can't satisfy the modern science and technology social requirement in fact and must concentrate on specific in the LAN with each User in the LAN.All can on its work position, directly carry out the communication meeting of the Internet in order to reach each User that can make in enterprise or the unit, public technology, please join Fig. 1, at internal network 20 with NAT or fire compartment wall 10, other establishes a voip gateway device (Gateway) 30, with the networking telephone that will transmit by the Internet (Internet) directly by voip gateway device (Gateway) 30 to change into plain old telephone, again by multi-party communication conferencing function that plain old telephone had, with its switching and be directly connected to the personnel positions that each must conference participation, yet this kind mode, owing to only utilize VoIP to do the contact of conference communications, therefore, on the one hand, it only can limit the communication that is applied to voice (Voice), as for utilizing the Internet to carry out the demand of video conference (Video Conference), then can't reach in this way, in brief, it only possesses the communication connection that the communication that utilizes the Internet replaces black phone, and reaches the requirement that reduces cost; On the other hand, because it, connects the networking telephone on the Internet (Internet) and the phone in the unit by VoIP Gateway, therefore, be not connected into internal network, do not integrate yet, and can't reach the requirement that the multi-media communication meeting is provided and integrates with internal network with inner IP.

Therefore, develop a kind of multimedia conference system and method for novelty, can carry out direct point-to-point multimedia conferencing communication with external network with each User that reaches internal network, and take into account NAT and fire compartment wall provides the information security of giving internal network, being has very big value.

Summary of the invention

Therefore, a purpose of the present invention provide a kind of User of internal network can be directly and the intelligencer of the external network multimedia conference system and the method for carrying out direct communication.

An of the present invention purpose provides and can dispose with original LAN, the intervention that neither needs human configuration to set, also need not change the network settings of internal network, can reach the User of internal network and multimedia conference system and the method that external network carries out direct communication.

A further object of the present invention provides the conference participation person of internal network and external network, can not be subjected to the restriction of its network site and possesses the multimedia conference system and the method for the direct communication of personal mobility (personal mobility).

Another object of the present invention provides no fire compartment wall/NAT interference to inside and outside communication, and the while can be taken information security into account and reach the User of internal network and multimedia conference system and the method that external network carries out direct communication.

For reaching above-mentioned purpose, the present invention includes the network phone (User agents) of (energy call accepted) more than, to constitute internal network; One calling terminal, it is positioned at outside the internal network, and must be connected with internal network through external network; A network address translation (nat), it is between between this calling terminal and this internal network; An acting server, it is between between this calling terminal and this internal network, and in logic with the network address translation (nat) configured in parallel, build the message of putting agreement to be responsible for the receiving meeting of sending by calling terminal, the go forward side by side connection and the transmission of row address are to be sent to this message particular network phone (User agents).

For reaching above-mentioned purpose, another characteristics of the present invention are: this acting server more includes plural network interface (Network Interface), wherein at least one network interface connects external network, and at least one network interface connects internal network, build the message of putting agreement to be responsible for the receiving meeting of sending by calling terminal, the go forward side by side connection and the transmission of row address are to be sent to this message particular network phone (User agents).

For reaching above-mentioned purpose, another characteristics of the present invention are: this acting server more comprises a logon server (Registration Server) in logic, make the interior more than one network phone (User agents) of this internal network can do the login of URI (Uniform ResourceIndentifier) to this logon server, and, this acting server can be obtained the contact inventory (Contact List) of the network phone (User agents) of logining URI to this logon server, and according to the mode of URI location, with the calling that calling terminal sends, be transferred to individual networks phone (Useragent).

For reaching above-mentioned purpose, more characteristics of the present invention are: this acting server is with virtual protocol phone (Backend to Backend User Agent, B2BUA) mode, as the dialogue media between this calling terminal and network phone (User agents), so that " calling terminal is to network phone (Useragents) " and " network phone (User agents) is to calling terminal " two dialogues (call legs) are connected, and, RTP forwarding mechanism (RTP RELAY) between this virtual protocol phone (B2BUA) and foundation " calling terminal " and " network phone (User agents) ", and, carry out instant multimedia conferencing communication to meet the mode of RTP (Real Time Transport Protocal) agreement.

By the present invention, can solve internal network can't directly carry out point-to-point multimedia conferencing with external network because of the existence of NAT or fire compartment wall problem, and can be set under the demand prerequisite of taking information security into account with original internal network, System and method for that can directly carry out point-to-point multimedia conferencing communication of construction, and make each meeting participant of internal-external network, can not be subjected to the restriction in space, at any time, everywhere carry out multimedia conference communications such as directly point-to-point or multi-multipoint voice, video signal mutually.

Following joint will be narrated further feature of the present invention.In the execution mode for embodiment only be example and unrestricted the present invention.Further, the method that embodiment lifted, step, system, device, configuration or other have optionally that part does not also limit the present invention.Remove this, the present invention is defined by the claim scope.

Description of drawings

Fig. 1 utilizes voip gateway device (Gateway) for prior art the networking telephone that the Internet (Internet) transmits is changed into plain old telephone, to constitute the schematic diagram of point-to-point direct communication.

Fig. 2 acts on behalf of the Conference Calling program diagram that server is made calling medium (call mediation) for the SIP communications protocol with one.

Fig. 3 is a NAT and the parallel enforcement illustration of building the acting server of putting that meets the requirement of SIP communications protocol with NAT of comprising of the present invention.

Fig. 4 is among the aforesaid embodiment of the present invention, and this acting server that meets the SIP communications protocol carries out multi-media conference call control, online and schematic diagram that communication is carried out between for internal network and external network.

Fig. 5 is the program that the acting server that meets the SIP communications protocol of the embodiment of the invention carries out Conference Calling at internal network to external network, to constitute the online key diagram of internal-external network multimedia conferencing.

Fig. 6 is for the acting server that meets the SIP communications protocol of embodiment of the invention network program that internal network is carried out Conference Calling externally, to constitute the online key diagram of internal-external network multimedia conferencing.

Symbol description among the figure:

10 calling terminals

20 acting servers

30 called sides

The multimedia conference system of 100 direct communication between internal-external network

101 to 105 constitute the network phone (User Agents) of internal lan network

110 internal networks

120 network address translation (nat)s

130 acting servers

140 Asymmetrical Digital Subscriber Lines (ADSL)

150 external networks

210 internal networks

211 internal network User A (Internal Computer)

212 internal network User B (Internal Computer)

220 external networks

221 external network User D

230 acting servers

310 internal network User (Call Agent)

320 external network called sides (Called SIP Terminal)

The 330SIP server

340 virtual protocol phones (Backend to Backend User agent, B2BUA)

510 external network calling terminals (Calling SIP Terminal)

520 internal network User (Call Agent)

The 530SIP server

540 virtual protocol phones (Backend to Backend User agent, B2BUA)

Embodiment

Fig. 2 illustrates that the SIP communications protocol acts on behalf of the Conference Calling program diagram that server is made calling medium (call mediation) with one, how to carry out the calling of multimedia conferencing and online in order to explanation SIP communications protocol, as shown in Figure 2, wherein, calling terminal 10 is sent the acting server 20 (step 41) that (transmit) Conference Calling (session request message)-INVITE gives calling medium, and this acting server 20 will be called out INVITE then and be sent to called side 30 (step 42).

Then, called side 30 is to transmit a message (100Trying) to give acting server 20 (step 43), and this acting server 20 sends this message (100Trying) to calling terminal 10 (step 44) then.And, this called side 30 can transmit one and call out signal (calling signal) (180Ringing) to acting server 20 (step 45), this acting server 20 sends this signal (180Ringing) to calling terminal 10 (step 46) then, and it has received calling to inform calling terminal 10.

Afterwards, called side 30 transmits a message (200OK) and gives acting server 20 (step 47), and this acting server 20 sends this message (200OK) to calling terminal 10 (step 48) then, to accept the requirement of meeting; Then, calling terminal 10 transmits confirms that message-ACK gives acting server 20 (step 49), and this acting server 20 is sent to ACK called side 30 (step 50) then, and sets up the online of meeting, after this, calling terminal 10 and called side 20 can carry out the communication of meeting.

Fig. 3 is a kind of enforcement illustration that can carry out the multimedia conference system of direct communication between internal-external network of the present invention, as shown in Figure 3, the multimedia conference system 100 of direct communication of the present invention, comprise: the network phone (User agents) 101 of (energy call accepted) more than, 102,103,104,105, to constitute internal network 110; One calling terminal 150, it is positioned at outside the internal network 110, and must be connected with internal network 110 through external network; A network address translation (nat) 120, it is between 110 of this calling terminal 150 and this internal networks; An acting server 130, it is between 110 of this calling terminal 150 and this internal networks, and in logic with network address translation (nat) 120 configured in parallel, build the message of putting agreement to be responsible for the receiving meeting of sending by calling terminal 150, the go forward side by side connection and the transmission of row address, this message is sent to particular network phone (User agents), and carry out the calling of multimedia conferencing communication and online in the mode that meets the SIP communications protocol, the calling of finishing the meeting between internal-external network and online after, then with " virtual protocol phone " (Backend to Backend Useragent of SIP communications protocol definition, B2BUA) carries out being connected that (i.e. " internal network is to external network " and " external network is to internal network ") talks with between internal-external network, at last, and to meet the mode of RTP (Real TimeTransport Protocal) agreement, carry out the compression and the transmission of data, to reach instant, directly multi-media communication.

Fig. 4 illustrates among the aforesaid embodiment of the present invention, this acting server that meets the SIP communications protocol carries out multi-media conference call control between for internal network and external network, the online schematic diagram that carries out with communication, as shown in Figure 4, internal network 210 comprises two network phones (User agents) (internal computer): network phone (User agent) A 211 and network phone (Useragent) B 212, external network 220 then comprises network phone (User agent) D 221, wherein, the IP address of network phone (User agent) A 211 is: 192.0.2.101, and the IP address of network phone (User agent) B 212 is: 192.0.2.103; And the IP address of network phone (Useragent) D 221 is: 17.0.0.1, and the private IP address of acting server 230: 192.0.2.102, public ip address is: 10.0.0.1.

Because the calling medium (call mediation) that acting server 230 internal network network phone (User agent) A 211 and network phone (User agent) B 212 are external, it is the destination address of its external message that network phone (User agent) A 211 and network phone (User agent) B 212 set (configure) with the private IP address of acting server 230: 192.0.2.102, and transmit the message of coming in from external network 220, then with and the public ip address of acting server 230: 10.0.0.1 is a destination address, because meeting participants all in internal network 210 and the external network 220 must register its SIP identification (identity) in advance, be defined unified source identification (the Uniform Resource Identifier of Session Initiation Protocol, URI), to acting server 230, therefore, this external network 220 transmits the message of coming in and can in the mode of URI (Uniform Resource Identifier) message be located by acting server 230 and be sent on the specific User.

Acting server 230 is responsible for execution: (1) according to the SIP communications protocol, carries out the calling of meeting and online; (2), carry out the dialogue media of internal network 210 and external network 220 according to the defined virtual protocol phone of SIP communications protocol (B2BUA); (3) according to RTP (Real TimeTransport Protocal) agreement, carry out the compression and the transmission of data, so that instant, direct point-to-point multi-media communication to be provided.

The calling of desiring to carry out internal network 210 and external network 220 meetings and online before, internal network 210 and necessary its SIP identification (SIPidentity) of registration in advance of the meeting participant of external network 220, be defined unified source identification (the Uniform ResourceIdentifier of Session Initiation Protocol, URI), to acting server 230, wherein, acting server 230 when online (calling of carrying out the SIP meeting with) is understood and be listened to the calling of internal-external network two boundary faces in default port 5060 (default port 5060), and, listen to the calling of two boundary faces at default port 7060 (default port 7060) to carry out the virtual protocol phone (B2BUA) of internal network 210 and external network 220 dialogue media; In case have from the external network 220 or the calling to acting server 230 of being sent by internal network 210, this acting server 230 will be done following affirmation:

1. require the content of (URI request) to belong to public network message (this promptly carries out Conference Calling by 210 pairs of external networks of internal network 220) about URI.

2. require the content of (URI request) to belong to the internal network message about URI, and the person of process be common path (this promptly carries out Conference Calling by 220 pairs of internal networks of external network 210).

If above-mentioned one of them is true, then acting server 230 promptly can give calling addressing (route) transmission, then to carry out the dialogue medium capability of virtual protocol phone (B2BUA), by virtual protocol phone (B2BUA) function this calling is added that its contact IP (contact IP) is with after writing down its source path, again this calling is sent to the destination, and finish the calling of conference communications and online, in addition, when carrying out virtual protocol phone (B2BUA) function, the field (SDP parameter ' sOrigin) of acting server 230 meeting modification SDP (Session Description Protocal) parameters and link field (Connection filed) are come the RTP function in the notification agent server 230, carry out RTP Relay-to open its RTP port of communication each side, make its grade can carry out instant conference communications.

More specifically, when the acting server 230 that meets the SIP communications protocol, set up the calling of multimedia conferencing and online according to the SIP communications protocol, and after internal network 210 and external network 220 contacted, the signal of this SIP will be addressed to virtual protocol phone (B2BUA), if the calling (outgoing call) that the network phone of this SIP signal internal network 210 (User agent) is external, virtual protocol phone (B2BUA) will stop this SIP signal, and produce a new signal (changing SIP signal parameter and SDP parameter) and be sent to external network 220, vice versa, be about to the network phone (User agent) that calling (incoming call) in 220 pairs of the external networks is sent to internal network 210, therefore, can be by virtual protocol phone (B2BUA) with " interior external " and " internally outer " two dialogue (call leg, dialogue) connected, after the dialogue connection of virtual protocol phone (B2BUA) is finished, then carry out instant dialogue communication by RTP (Real timeTransport Protocal) Relay.

The acting server that meets the SIP communications protocol of Fig. 5 embodiment of the invention carries out the program of Conference Calling to external network at internal network, to constitute the online key diagram of internal-external network multimedia conferencing, as shown in Figure 5, for ease of the explanation of thin portion flow process, be " calling of meeting and on-line working " that acting server in the described embodiment of the invention of Fig. 4 is responsible for carrying out to be reached " dialogue of media internal network and external network " two work reach " virtual protocol phone " (B2BUA) respectively with " sip server " and represent among Fig. 5.

At first, " called side " (called SIP terminal) 320 of 310 pairs of external networks of network phone (User agent) in the internal network calls out (invite), the then addressed external sip server of internal network 330 (steps 401) that are sent to of this calling (INVITE), and sip server 330 this calling soon behind the via that adds its record path is sent to virtual protocol phone (B2BUA) 340 (steps 402), 340 of virtual protocol phones (B2BUA) then require (URI Request) to carry out the affirmation inspection of DNS (Domain Name Server) to URI, IP address with the destination of obtaining this calling, then previous via file header information (header) is removed afterwards, and after revising contact address (contact address) and SDP parameter, add the via file header information (header) of himself, then, this calling (INVITE) can addressed (route) to URI require (URI Request) the IP address of corresponding destination, (not shown) behind one or more acting server of process, this calling (INVITE) promptly is sent to called side 320 (step 403).

Afterwards, called side 320 can transmit a message (100Trying) earlier and give virtual protocol phone (B2BUA) 340 (steps 404), back called side 320 responds after adding the contact IP address of himself calls out (180Ringing), the response of this called side 320 promptly can be sent to virtual protocol phone (B2BUA) (step 405), virtual protocol phone (B2BUA) is after removing the via file header information (header) of this response (180Ringing), and change the contact IP address of called side 320 into its contact IP address, and after the via file header information (header) of insertion sip server 330 and the via file header information (header) of this User 310, should respond (180Ringing) and deliver to sip server 330, reach User 310 (step 406) and sip server 330 should respond (180Ringing) again; And also following this path, the online response (200OK) of the acceptance of called side 320 finishes (step 407,408).

After constituting network phone (User agent) 310 and called side 320 online, the online affirmation (ACK) of network phone (User agent) 310 promptly can directly be sent to virtual protocol phone (B2BUA) 340 (steps 409), and directly online affirmation (ACK) is sent to called side 320 (step 410) by virtual protocol phone (B2BUA) 340, after the calling and online establishment of meeting, and after calling terminal network phone (User agent) 310 knew the other side's contact IP address mutually with called side 320, both sides promptly directly carried out instant conference communications by virtual protocol phone (B2BUA) 340 and RTP Relay.

To interrupt the online of meeting as network phone (User agent) 310, then transmit a meeting interruption message (BYE) to virtual protocol phone (B2BUA) 340 (steps 411), virtual protocol phone (B2BUA) 340 is sent to called side 320 (step 412) with meeting interruption message (BYE) more then, and called side 320 will be accepted the message (200OK) that meeting is interrupted again, be sent to virtual protocol phone (B2BUA) 340 (steps 413), and will accept message (200OK) the return network phone that meeting interrupts by virtual protocol phone (B2BUA) 340 and give (Useragent) 310 (step 414), and finish the interruption of meeting.

The acting server that meets the SIP communications protocol of Fig. 6 embodiment of the invention is the network program of internal network being carried out Conference Calling externally, to constitute the online key diagram of internal-external network multimedia conferencing, as shown in Figure 6, for ease of the explanation of thin portion flow process, be " calling of meeting and on-line working " that acting server in the described embodiment of the invention of Fig. 4 is responsible for carrying out to be reached " dialogue of media internal network and external network " two work reach " virtual protocol phone " (B2 BUA) respectively with " sip server " and represent among Fig. 6.

At first, the calling terminal of external network (calling SIP terminal) 510 pairs of inner network of network phones (User agent) 520 are called out (INVITE), the then addressed sip server 530 (step 601) that is sent to of this calling (INVITE), wherein, the IP address of sip server 530 is set to the external network inlet of this DNS (Domain Name Server), sip server 530 is behind receipt of call, promptly position detection (location look-up) is carried out in this calling, and the URI in the call forwarding message that calling terminal 510 is transmitted requires (URI Request) to change the IP address of network phone (User agent) 520 into, and behind the via that adds its record path, be about to this calling and be sent to virtual protocol phone (B2BUA) 540 (steps 602), virtual protocol phone (B2BUA) 540 can remove the via file header information (header) in the prior message, and after revising contact address (contact address) and SDP parameter, add the via file header information (header) of himself, then, to call out (INVITE) addressing (route) and require the IP address of (URI Request) pairing network phone (User agent) 520, and this calling will be sent to network phone (User agent) 520 (steps 603) to the URI of this call forwarding message.

Network phone (User agent) 520 can transmit a message (100Trying) earlier and give virtual protocol phone (B2BUA) 540 (steps 604), and then call (180Ringing) is sent to virtual protocol phone (B2BUA) 540 (steps 605), virtual protocol phone (B2BUA) 540 can remove the via file header information (header) of this call (180Ringing), and after the via file header information (header) of the via file header information (header) of inserting sip server 530 and this calling terminal 510, (180Ringing) delivers to sip server 530 with this call, and sip server 530 reaches this call (180Ringing) calling terminal 510 (step 606) again, and network phone (User agent) 520 is accepted online response (200OK) and is also followed this path and finish (step 607,608).

After constituting calling terminal 510 and network phone (User agent) 520 online, the online affirmation (ACK) of calling terminal 510 promptly can directly be sent to virtual protocol phone (B2BUA) 540 (steps 609), and directly online affirmation (ACK) is sent to User 520 (step 610) by virtual protocol phone (B2BUA) 540, after the calling and online establishment of meeting, and after calling terminal 510 knew the other side's contact IP address mutually with network phone (User agent) 520, both sides promptly directly carried out instant conference communications by virtual protocol phone (B2BUA) 540 and RTP Relay.

To interrupt the online of meeting as calling terminal 510, then transmit a meeting interruption message (BYE) to virtual protocol phone (B2BUA) 540 (steps 611), virtual protocol phone (B2BUA) 540 is sent to meeting interruption message (BYE) network phone (User agent) 520 (steps 612) more then, and network phone (User agent) 520 will be accepted the message (200OK) that meeting is interrupted again, be sent to virtual protocol phone (B2BUA) 540 (steps 613), and will accept message (200OK) passback that meeting interrupts by virtual protocol phone (B2BUA) 540 and give calling terminal 510 (step 614), and finish the interruption of meeting.

It should be noted the foregoing description only be example and unrestricted the present invention.Further, the processing procedure that embodiment lifted, step, material, yardstick, structure or other have optionally that part does not also limit the present invention.Remove this, the present invention is defined by the claim scope.

Claims (36)

1. the multimedia conference system of a direct communication between internal-external network is characterized in that, comprising:

The network phone of energy call accepted more than one, to constitute internal network, the network phone of this call accepted is defined as the network phone;

One calling terminal, it is positioned at outside this internal network, and is connected with this internal network through external network;

A network address translation, it is between between this calling terminal and this internal network;

An acting server, it is between between this calling terminal and this internal network, and in logic with the network address translation configured in parallel, build the message of putting agreement to be responsible for the receiving meeting of sending by calling terminal, the go forward side by side connection and the transmission of row address are sent to described network phone this meeting is built the message of putting agreement.

2. multimedia conference system as claimed in claim 1 is characterized in that, this acting server is selected the network phone to the calling that calling terminal proposed, and this acting server is as the interface between it, to connect the both sides of conference communications.

3. multimedia conference system as claimed in claim 1 is characterized in that, this acting server is to meet the mode of SIP communications protocol, to build the calling of putting conference communications and online.

4. multimedia conference system as claimed in claim 2 is characterized in that this acting server has plural network interface, and wherein at least one network interface connects external network, and at least one network interface connects internal network.

5. multimedia conference system as claimed in claim 4 is characterized in that, the network interface of this connection external network has independently public IP, and the network interface of this connection internal network then has the IP that internal network defines the net territory.

6. multimedia conference system as claimed in claim 3 is characterized in that, this acting server is transferred to the network phone with the calling that calling terminal sends.

7. multimedia conference system as claimed in claim 5 is characterized in that, this acting server more comprises a logon server in logic, and this more than one network phone is done the login of URI to logon server.

8. multimedia conference system as claimed in claim 7, it is characterized in that this acting server can be obtained the contact inventory of the network phone of logining URI to this logon server, and according to the mode of URI location, with the calling that calling terminal sends, be transferred to the network phone.

9. multimedia conference system as claimed in claim 8 is characterized in that, this acting server is in virtual protocol phone mode, as the dialogue media between this calling terminal and network phone.

10. multimedia conference system as claimed in claim 9 is characterized in that, two dialogues are connected the virtual protocol phone of this acting server to calling terminal to network phone and network phone with calling terminal.

11. multimedia conference system as claimed in claim 10 is characterized in that, the virtual protocol phone of this acting server is set up the RTP forwarding mechanism between calling terminal and network phone.

12. multimedia conference system as claimed in claim 11 is characterized in that, this acting server carries out instant multimedia conferencing communication to meet the mode of Real-time Transport Protocol.

13. the multimedia conference system that can carry out direct communication between internal-external network is characterized in that, comprising:

The network phone of energy call accepted more than one, to constitute internal network, the network phone of this call accepted is defined as the network phone;

An acting server, it is connected with the network phone by this internal network, and this acting server receives the meeting of being sent by network phone in the internal network and builds the message of putting agreement, the connection of the row address of going forward side by side and transmission as the interface of external network;

One called side, it is connected with this acting server by external network;

A network address translation, it is between between this called side and this internal network, and this network address translation is put with parallel in logic the building of this acting server.

14. multimedia conference system as claimed in claim 13 is characterized in that, the calling that this acting server is proposed the network phone, and by the DNS inquiry, to connect called side, this acting server is as the interface between the both sides of conference communications.

15. multimedia conference system as claimed in claim 13 is characterized in that, this acting server is to meet the mode of SIP communications protocol, to build the calling of putting conference communications and online.

16. multimedia conference system as claimed in claim 14 is characterized in that, this acting server has plural network interface, and wherein at least one network interface connects external network, and at least one network interface connects internal network.

17. multimedia conference system as claimed in claim 16 is characterized in that, the network interface of this connection external network has independently public IP, and the network interface of this connection internal network then has the IP that internal network defines the net territory.

18. multimedia conference system as claimed in claim 15 is characterized in that, this acting server is transferred to called side with the calling that the network phone sends.

19. multimedia conference system as claimed in claim 17 is characterized in that, this acting server more comprises a logon server in logic, and this more than one network phone can be done the login of URI to logon server.

20. multimedia conference system as claimed in claim 19 is characterized in that, this acting server is in virtual protocol phone mode, as the dialogue media between this network phone and called side.

21. multimedia conference system as claimed in claim 20 is characterized in that, two dialogues are connected the virtual protocol phone of this acting server to the network phone to called side and called side with the network phone.

22. multimedia conference system as claimed in claim 21 is characterized in that, the virtual protocol phone of this acting server is set up the RTP forwarding mechanism between network phone and called side.

23. multimedia conference system as claimed in claim 22 is characterized in that, this acting server carries out instant multimedia conferencing communication to meet the mode of Real-time Transport Protocol.

24. the method that can carry out the multimedia conferencing of direct communication between internal-external network is characterized in that, comprising:

(1) setting one meets the acting server of Session Initiation Protocol, this acting server is arranged between internal network and external network, this acting server and network address translation be configured in parallel in logic, the message of putting agreement is built in the meeting that calling terminal transmitted that reception is connected with internal network through external network, this message is confirmed in check, and the metered call end sends the source path of call forwarding message;

(2) the network phone being set a meeting builds and puts message and store access path;

(3) according to the access path of the network phone after selecting in external network calling terminal and the internal network, carry out multimedia conference communications.

25. the method for multimedia conferencing as claimed in claim 24 is characterized in that, this step (2) more comprises: (2-1) logon server that comprised in addition in logic in acting server of the network phone of internal network carries out the login of URI.

26. the method for multimedia conferencing as claimed in claim 25, it is characterized in that, this step (2-1), more comprise: (2-2) acting server is obtained the contact inventory of the network phone of logining URI to this logon server, and according to the mode of URI location, with the calling that calling terminal sends, be transferred to the network phone.

27. the method for multimedia conferencing as claimed in claim 26, it is characterized in that, should (3) step more comprise: (3-1), carry out the multimedia conference communications through between the network phone after the selection in external network calling terminal and the internal network with the virtual protocol phone media that engages in the dialogue.

28. the method for multimedia conferencing as claimed in claim 27 is characterized in that, should (3-1) step carries out the network phone to the connection to two dialogues of network phone of calling terminal and calling terminal with the virtual protocol phone.

29. the method for multimedia conferencing as claimed in claim 28 is characterized in that, should (3-1) step more comprise: (3-2) the virtual protocol phone carries out the foundation of the RTP forwarding mechanism between network phone and calling terminal.

30. the method for multimedia conferencing as claimed in claim 29 is characterized in that, should (3-2) step in a mode that meets Real-time Transport Protocol, carry out the instant multimedia conferencing communication of communication each side.

31. the method that can carry out the multimedia conferencing of direct communication between internal-external network is characterized in that, comprising:

(1) setting one meets the acting server of Session Initiation Protocol, this acting server is arranged between an internal network and an external network, this acting server and network address translation be configured in parallel in logic, the message of putting agreement is built in the meeting that reception is sent by network phone in the internal network, this message is confirmed in check, and record network phone sends the source path of calling out INVITE;

(2) this acting server calling INVITE that the network phone is sent by the DNS inquiry, is stored in the outer called side of internal network with connection, and builds at this meeting and to put message and store access path;

(3) according to the access path of the network phone of the internal network called side outer, carry out multimedia conference communications with being stored in internal network.

32. the method for multimedia conferencing as claimed in claim 31 is characterized in that, this step (1) more comprises: (1-1) logon server that comprised in addition in logic in acting server of the network phone of internal network carries out the login of URI.

33. the method for multimedia conferencing as claimed in claim 32, it is characterized in that, should (3) step more comprise: (3-1) with the virtual protocol phone as the dialogue media, the multimedia conference communications between the network phone that carries out internal network and internal network called side outward.

34. the method for multimedia conferencing as claimed in claim 33 is characterized in that, should (3-1) step carries out the network phone to the connection to two dialogues of network phone of called side and called side with the virtual protocol phone.

35. the method for multimedia conferencing as claimed in claim 34 is characterized in that, should (3-1) step more comprise: (3-2) carry out the foundation of the RTP forwarding mechanism between network phone and called side with the virtual protocol phone.

36. the method for multimedia conferencing as claimed in claim 35 is characterized in that, should (3-2) step in a mode that meets Real-time Transport Protocol, carry out the instant multimedia conferencing communication of communication each side.

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